My water pump started leaking so I decided to take it apart inspect things. What I found was not pretty!The metal check valves had pounded out the backside of the seat to the pointwhere it was a check valve in both directions! This was likely causing veryhigh forces on the water pump pistons, which is probably why my cross heads areso worn.

The fix is to machine the pumps to accept 3/8" nylon balls. I cut the seats at45° and milled clearance slots on the backside so water can flow around theballs.

You will find detailed photos in the files section in "Wayman modificationphotos". at

This failure happened at about 400 miles. I highly recommend that youdo not run more than 200 miles with your origional stainless steel checkvalves, as you may have the same problem with possible cross head wear.